Title: CONFIGURATIONAL SPLITTING IN RAMAN SCATTERING SPECTRA OF CRYSTALS WITH THE ORDER-DISORDER TYPE PHASE TRANSITIONS
Authors: I.V.Stasyuk, Ya.L.Ivankiv (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 290011 Lviv, Ukraine)

A system of equations for the averaged phonon Green function determining the shapes of the lines in Raman scattering spectra is obtained in the coherent potential approximation. Configurationally split components of the Raman scattering are studied within a simple model. For the KH$_2$PO$_4$ and the CsH$_2$PO$_4$-type ferroelectrics the possibility to observe the configurational splitting experimentally is discussed.

Comments: Figs. 3, Refs. 18, Tabs. 2.